content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * -----------------
   * StrokeSample.java
   * -----------------
   * (C) Copyright 2000-2012, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * Changes (from 26-Oct-2001)
   * --------------------------
   * 26-Oct-2001 : Changed package to com.jrefinery.ui.*;
   * 14-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   * 21-Mar-2003 : Fixed null pointer exception, bug 705126 (DG);
   * 16-Jun-2012 : Moved from JCommon to JFreeChart (DG);
   *
   */
  
  package org.jfree.chart.ui;
  
  import java.awt.Component;
  import java.awt.Dimension;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.Insets;
  import java.awt.RenderingHints;
  import java.awt.Stroke;
  import java.awt.geom.Ellipse2D;
  import java.awt.geom.Line2D;
  import java.awt.geom.Point2D;
  import javax.swing.JComponent;
  import javax.swing.JList;
  import javax.swing.ListCellRenderer;
  
  /**
   * A panel that displays a stroke sample.
   */
  public class StrokeSample extends JComponent implements ListCellRenderer {
  
      private static final long serialVersionUID = 1L;
  
      /** The stroke being displayed (may be null). */
      private Stroke stroke;
  
      /** The preferred size of the component. */
      private Dimension preferredSize;
  
      /**
       * Creates a StrokeSample for the specified stroke.
       *
       * @param stroke  the sample stroke (<code>null</code> permitted).
       */
      public StrokeSample(final Stroke stroke) {
          this.stroke = stroke;
          this.preferredSize = new Dimension(80, 18);
          setPreferredSize(this.preferredSize);
      }
  
      /**
       * Returns the current Stroke object being displayed.
       *
       * @return The stroke (possibly <code>null</code>).
       */
      public Stroke getStroke() {
          return this.stroke;
      }
  
      /**
       * Sets the stroke object being displayed and repaints the component.
       *
       * @param stroke  the stroke (<code>null</code> permitted).
       */
      public void setStroke(final Stroke stroke) {
          this.stroke = stroke;
          repaint();
      }
  
      /**
       * Returns the preferred size of the component.
       *
       * @return the preferred size of the component.
       */
      @Override
      public Dimension getPreferredSize() {
          return this.preferredSize;
      }
  
      /**
       * Draws a line using the sample stroke.
       *
       * @param g  the graphics device.
       */
      @Override
      public void paintComponent(final Graphics g) {
  
          final Graphics2D g2 = (Graphics2D) g;
          g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                  RenderingHints.VALUE_ANTIALIAS_ON);
          final Dimension size = getSize();
          final Insets insets = getInsets();
          final double xx = insets.left;
          final double yy = insets.top;
          final double ww = size.getWidth() - insets.left - insets.right;
          final double hh = size.getHeight() - insets.top - insets.bottom;
  
          // calculate point one
          final Point2D one =  new Point2D.Double(xx + 6, yy + hh / 2);
          // calculate point two
          final Point2D two =  new Point2D.Double(xx + ww - 6, yy + hh / 2);
          // draw a circle at point one
          final Ellipse2D circle1 = new Ellipse2D.Double(one.getX() - 5,
                  one.getY() - 5, 10, 10);
          final Ellipse2D circle2 = new Ellipse2D.Double(two.getX() - 6,
                  two.getY() - 5, 10, 10);
  
          // draw a circle at point two
          g2.draw(circle1);
          g2.fill(circle1);
          g2.draw(circle2);
          g2.fill(circle2);
  
          // draw a line connecting the points
          final Line2D line = new Line2D.Double(one, two);
          if (this.stroke != null) {
              g2.setStroke(this.stroke);
              g2.draw(line);
          }
  
      }
  
      /**
       * Returns a list cell renderer for the stroke, so the sample can be
       * displayed in a list or combo.
       *
       * @param list  the list.
       * @param value  the value.
       * @param index  the index.
       * @param isSelected  selected?
       * @param cellHasFocus  focussed?
       *
       * @return the component for rendering.
       */
      @Override
      public Component getListCellRendererComponent(JList list, Object value,
              int index, boolean isSelected, boolean cellHasFocus) {
          if (value instanceof Stroke) {
              setStroke((Stroke) value);
          }
          else {
              setStroke(null);
          }
          return this;
      }
  
  }
  